Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7bccccd9871c23…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 12:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 687f91c6764c5f1c43e3a589be880b72 SHA-1: f7fc17e0fc8948c12fabdd8e6731fd3916e9f272 SHA-256: 0f7bccccd9871c238419ffe9db4ccc515d716f8a3a0afe53cd50e9a930373560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The PDF structure itself is also flagged for containing duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d967fb120e---beridirujililexokofe.pdf In PDF document text
    • http://firmen-bekleidung.at/userfiles/file/17752781075.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/6047021234.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a74eee570---73097172930.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130f0741835---komisate.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/govinemepog.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/23403473357.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/17913712673.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wivibimizeporaroleju.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/78383930374.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/54757703069.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38035344514.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/98765300924.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/71304190065.pdfIn PDF document text
    • http://szhlfz.net/upload/6304730703.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a069995eec70c066984e03206c1700bb/96518903905.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b29202eea---84752330775.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0a6eddc94c9d71e4f4c1b66dc237b38a/nonige.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b85dbb92242---baligat.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/75457304480.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wobofijotabepi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/wodagiwaxawozapawiw.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/zijelodibuse.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/487abed82bca37904ebedcdad5645137/2264044579.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/jelujow.pdfIn PDF document text
    • https://nada70.org/userfiles/file/ribotetifogesixet.pdfIn PDF document text
    • http://ubranni.com/uploader/files/43362889328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=le+trait%C3%A9+de+versailles+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 10444 bytes
SHA-256: fff0a85e10c5687a5974a94713ddd4a8605ba2aabaeb73b55012a14b1192bfc4
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 19776 bytes
SHA-256: 284e870c6929169234bfffc16b426f98807205fb9cf43a042ccfbf4b1e67bd3f
font_02_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1